Revolving type thread winding machine

ABSTRACT

A multi-end revolving type automatic winding machine exhibiting high operationality, threading operability and space efficiency, and arranged such that two turret tables ( 3, 3 ′) are disposed on the opposite sides of a yarn passage, rotational directions of a press roller ( 9 ) provided for one turret table ( 3 ) and a press roller ( 9 ′) provided for the other turret table ( 3 40 ) are reversed, rotational directions of one turret table ( 3 ) and the other turret table ( 3 ′) are reversed, and the center of each press roller ( 9, 9 ′) touching a bobbin holder or a yarn being wound during winding of yarn is located between an imaginary line c connecting the centers of two bobbin holders ( 4, 5 ) projecting from one turret table ( 3 ′) and an imaginary line c′ connecting the centers of two bobbin holders ( 4′, 5 ′) projecting from the other turret table ( 3 ′).

TECHNICAL FIELD

The present invention relates to a revolving type automatic yarn windingmachine. More specifically, the present invention relates to a revolvingtype automatic yarn winding machine which comprises a turret tablerotatably mounted on a unit case, the turret table having a plurality ofbobbin holders, for inserting yarn winding bobbins thereon, rotatablymounted thereon, and wherein yarn winding operation is switched to abobbin installed on the other bobbin holder when the yarn wound on onebobbin holder reaches a predetermined amount.

BACKGROUND ART

When a yarn spun from spinnerets of a spinning machine is continuouslywound on a bobbin, a revolving type winding machine is generally used,which machine comprises a turret table rotatably mounted on a unit case,two bobbin holders rotatably mounted on the turret table for insertingyarn winding bobbins thereonto, a movable frame movable in a verticaldirection, a press roller rotatably mounted on the movable frame, and atraverse device disposed upstream the press roller seen along a yarnpassage.

For example, in such a conventional yarn winding machine, as illustratedin FIG. 12, two winding machines are adjacently disposed, and yarnsseparated from the upstream feed rollers are fed to the two windingmachines.

As another prior art, Japanese Patent Application Laid-open No. Hei1-267270 discloses a winding machine wherein a plurality of turrettables are vertically arranged on one machine frame.

Further, as another prior art, Japanese Patent Application Laid-open No.2002-515388 discloses a winding machine wherein two turret tables arevertically arranged on one machine frame, and thus constructed units aresymmetrically arrange in a horizontal direction.

In yarn winding machines, in recent years, there is a tendency to applymulti-ends, i.e., insertion of a plurality of bobbins onto one spindle,in order to increase production and application of multi-ends has beendone by combining winding machines. In this case, it is required toincrease the space efficiency per production, to reduce the equipmentcost, to increase threading operability, and to enhance the prettinessof the shape of wound packages.

In order to meet with the requirements, in the conventional machineillustrated in FIG. 12, since two winding machines are disposed inparallel, the distance between yarns entering into the two windingmachines becomes large, and accordingly, the angle α formed between twoyarns leaving the feed rollers, increases. As a result, there areproblems that the contacting angle between a yarn and a yarn guide Gbecomes large, that the frictional resistance increases, and that fluffsoccur in the yarn.

If the contacting angle between a yarn and a yarn guide G is made smallas a countermeasure for such problems, the positions of the feed rollersare lifted, and there occurs a problem that operationality is degraded.

In a winding machine disclosed in Japanese Patent Application Laid-openNo. Hei 1-267270, the turret tables are vertically arranged, andtherefore, the height of the machine becomes high and the operationalityis remarkably degraded.

Further, in a conventional winding machine disclosed in Japanese PatentApplication Laid-open No. 2002-515388, upon first threading operation, aplurality of yarns which are being sucked into a suction device arethreaded through fulcrum guide of traverse motion onto bobbins insertedonto bobbin holders which are in contact with press rollers disposeddownstream the traverse devices and are rotated, and accordingly, thereis the following problem.

The winding machines are arranged vertically and symmetrically in ahorizontal direction. Accordingly, upon threading operation, in order toavoid interference between yarns and the winding machines, it isnecessary to perform threading operation onto every winding machinesfrom one located at the upper stage or lower stage one by one while aplurality of yarns are being sucked. As a result, time needed forthreading operation becomes long, the amount of waste yarn increases,and efficiency is reduced.

When yarns are threaded onto the horizontally disposed winding machines,since the press rollers and the bobbin holders are in contact while theyare arranged horizontally, it is necessary for the yarns to be widelydeflected upon threading operation, and success ratio for threading isreduced.

Further, since the press rollers are horizontally retracted as theamount of wound yarn increase, the width of a winding machine becomeslarge, and space efficiency is remarkably reduced.

Taking the drawbacks inherent to the prior art into consideration, it isan object of the present invention to provide a multi-end revolving typeautomatic yarn winding machine which exhibits high operationality, highthreading operability and good space efficiency.

DISCLOSURE OF THE INVENTION

According to the present invention, the above-described object isachieved by a revolving type winding machine comprising two turrettables having at least two bobbin holders rotatably mounted thereon,respectively, a press roller and a traverse device are arrangedcorresponding to the bobbin holders upstream the respective turrettable, whereby a bobbin installed on one bobbin holder is switched to abobbin installed on the other bobbin holder when the yarn wound on thebobbin reaches a predetermined amount characterized in that the twoturret tables are disposed on the opposite sides of a yarn passage,rotational directions of a press roller provided for one turret tableand a press roller provided for the other turret table are reversed,rotational directions of the one turret table and the other turret tableare reversed, and the center of each press roller touching a bobbinholder or a yarn being wound during winding of yarn is located betweenan imaginary line c connecting the centers of two bobbin holdersprojecting from the one turret table and an imaginary line c′ connectingthe centers of two bobbin holders projecting from the other turrettable.

In this case, it is preferred that an imaginary line connecting thecenter of the press roller and the rotating center of the bobbin holderforms an angle β which is not larger than 45° relative to a verticalline.

Further, it is preferred that the imaginary lines c and c′ connectingthe centers of the respective two bobbin holders form “/\” shape atleast upon start of yarn winding.

Furthermore, it is preferred that a threading device is disposedcorrespondingly to each bobbin holder located at winding position, thethreading device is provided with a threading guide, and during storage,the threading guide is located at a storing position which is sandwichedby loci a and a′ drawn by outer surfaces of bobbins inserted onto thebobbin holders projecting from the turret tables upon rotation of theturret tables, while upon threading, a plurality of threading guides aremovable in such directions that they move away from each other from thestoring position to threading position which exceeds contacting lines band b′ between the press rollers and outer surfaces of rotating bobbinswhich are contacting with the press rollers.

The press rollers may be movable so that distance between the centers ofthe press rollers and the bobbin holders are expanded as the amount ofyarn wound on bobbins inserted onto the bobbin holders increase.

The turret tables having the bobbin holders projecting therefrom may bemovable so that distance between the centers of the bobbin holders andthe press rollers are expanded as the amount of yarn wound on bobbinsinserted onto the bobbin holders increase.

The press rollers may be linearly movable, it may be rotatably supportedat an end of an arm 31 or 31′, and the other end 32, 32′ of the arm 31or 31′ may be pivoted.

Further, when symmetric winding machines 1 and 1′ are disposed, andthreading and switching signals are simultaneously sent and the presentinvention is applied, the object and unexpected advantages of thepresent invention can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will now be explained with reference to theattached drawing wherein embodiments of the present invention areillustrated, wherein:

FIG. 1 is an elevation of an embodiment of a revolving type automaticyarn winding machine according to the present invention;

FIG. 2 is a side view of the embodiment upon initial threadingoperation;

FIG. 3 is a side view of the embodiment showing operation at the initialthreading operation subsequent to the condition illustrated in FIG. 2;

FIG. 4 is an elevation of the embodiment upon initial threadingoperation;

FIG. 5 is a view showing the condition wherein yarns are being woundonto bobbins inserted onto bobbin holders in the embodiment;

FIG. 6 is an elevation showing the yarn switching condition;

FIG. 7 is a side view seen in a direction perpendicular to bobbin holderupon switching;

FIG. 8 is a graph showing the positional relationship between a bobbinholder and a press roller;

FIGS. 9, 10 and 11 are elevations showing other embodiments of thepresent invention; and

FIG. 12 is an elevation of a certain conventional device.

BEST MODE FOR CARRYING OUT THE INVENTION

In FIGS. 1 and 2, a plurality of (eight in the present embodiment) yarnsY continuously fed from spinnerets (not shown) of a spinning machine arewrapped around feed rollers R1 and R2. A yarn guide G for separating aplurality of yarns Y at a predetermined distance is disposed at the exitof the feed roller R2.

Fulcrum guides 12 and 12′ of traverse motion are disposed downstream thefeed roller R2, so that passages of a plurality of yarns Y are regulatedby means of the fulcrum guides 12 and 12′ of traverse motion at adistance between the wound packages. The fulcrum guides 12 and 12′ oftraverse motion are movable in an axial direction along a device 11 formoving the fulcrum guides 12 and 12′ of traverse motion, which device ishorizontally disposed downstream the feed roller R2.

The body of a unit case 1 of a winding machine W is of a rectangularparallelpiped and has a base 2 extending to the operational space nearthe front end, i.e., the left side in FIG. 2, disposed at the bottomthereof. The unit case 1 has circular disc shaped turret tables 3 and 3′disposed at the front thereof and mounted rotatable about central axesextending into a horizontal direction, and they are rotated in oppositedirections, i.e., turret table 3 is rotated clockwise and the turrettables 3′ is rotated counter-clockwise, by means of driving means suchas motors (not shown).

The turret tables 3 and 3′ have two bobbin holders 4, 5 and 4′,5′,respectively, rotatably mounted thereon in a direction perpendicular tothe sheet on which FIG. 1 is drawn, i.e., in the sheet direction of FIG.2. The bobbin holders 4, 5 and 4′,5′ are connected to driving means (notshown), respectively, and two bobbin holders 4 and 5 are rotatedclockwise and the other two bobbin holders 4′ and 5′ are rotatedcounter-clockwise at a predetermined speed. Eight bobbins 6 may beinserted onto the bobbin holders 4, 5 and 4′,5′, respectively, of thisembodiment.

Although in the present embodiment, spindle drive type winding machinewherein bobbin holders are directly driven is explained, the presentinvention may be carried out in a friction drive type winding machinewherein a press roller is driven by means of an electric motor and thepress roller is brought into contact with a bobbin holder so as todrive.

The unit case 1 has two slide rails (not shown) vertically disposedinside thereof, a vertically movable frame 8 is moved in a verticaldirection along the slide rails by means of a fluid pressure cylinder(not shown).

The vertically movable frame 8 has press rollers 9 and 9′, which contactwith the bobbins 6 inserted onto the bobbin holders 4, 5, 4′ and 5′ oryarn layers formed on the bobbins 6, and a traverse device 10 mountedthereon, which device traverses the yarns Y in axial direction of thebobbin 6. The press rollers 9 and 9′ are supported on the verticallymovable frame 8 in such a manner that at least one is swingableindependently relative to the vertically movable frame 8.

The press rollers 9 and 9′ are in contact with the surfaces of thepackages intending that the press roller 9 and 9′ feed yarns Y to thebobbins 6 and press the yarns so that the prettiness of the shape of thewound packages is enhanced and that the hardness of the wound packagesis increased when the yarns Y are wound onto the bobbins 6 inserted ontothe bobbin holders 4, 5, 4′ and 5′.

In this embodiment, one traverse device 10 is disposed between the twopress roller 9 and 9′. The traverse device 10 is provided with acylindrical cam (not shown) which is driven by a drive means (notshown), and traverse guides engaging with the groove of the cam traversethe yarns Y to and fro in a direction of axis of the bobbins 6 withinthe traverse range.

Though the traverse device 10 of a traverse cam type is used in theembodiment, a traverse device, such as a traverse device of a rotaryblade type, may be used.

According to the present invention, the center of the press rollers 9and 9′ touching bobbin holders 4, 5, 4′, and 5′ are so constructed thatthey are located between an imaginary line c connecting the centers oftwo bobbin holders 4 and 5 projecting from one turret table 3 and animaginary line c′ connecting the centers of two bobbin holders 4′ and 5′projecting from the other turret table 3′.

According to the present invention, the two turret tables are disposedon the opposite sides of a yarn passage, rotational directions of apress roller provided for one turret table and a press roller providedfor the other turret table are reversed, and rotational directions ofone turret table and the other turret table are reversed. Accordingly,the width of a winding machine can be small, and space efficiencyincreases.

Further, upon start of yarn switching operation, in other words, uponstart of rotation of the turret table, since the turret table isaccelerated, there is a tendency that the bobbin holder is lifted by theacceleration. In order to overcome this tendency, in the presentinvention, the press roller 9 and 9′ are located in a specificgeometrical relationship with the turret tables 3 and 3′, morespecifically, the centers of the press rollers 9 and 9′ touching bobbinholders 4, 5, 4′, and 5′ are so constructed that they are locatedbetween an imaginary line c connecting the centers of two bobbin holders4 and 5 projecting from one turret table 3 and an imaginary line c′connecting the centers of two bobbin holders 4′ and 5′ projecting fromthe other turret table 3′. According to this geometrical construction,the bobbin holder is prevented from lifting the press roller due to theacceleration at the start of rotation of the turret tables 3 and 3′, andthe bobbin holders can rotate smoothly, and the inward movement of theouter yarn layer of package upon start of rotation of the turret tablesand yarn package damage due to excessive contacting pressure can beprevented from occurring, and there is an unexpected advantage that thequality of yarn can be enhanced.

Further, in addition to the above-described geometrical construction,when an imaginary line connecting the rotating center of the pressroller 9 or 9′ and the rotating center of the bobbin holders 4 or 5forms an angle β which is not larger than 45° relative to a verticalline d, the moving direction of the press roller 9 or 9′ can be almostvertical. Accordingly, the width of a winding machine can be small, andspace efficiency increases. (See FIG. 8.)

Furthermore, it is so constructed that the imaginary lines c and c′connecting the centers of the respective two bobbin holders 4, 5 and 4′,5′ form “/\” shape at least upon start of yarn winding. Morespecifically, the distance between the bobbin holders 4 and 4′ withempty bobbins is set smaller than the distance L wherein they have fullywound packages thereon, and at the same time, it is set larger than thedistance wherein the full packages just after switching operation do notinterfere with each other, and thus, the width of the winding machinecan be small.

In addition, as described above, the device 11 for moving the fulcrumguides is disposed almost horizontally and in parallel with the bobbinholders at a position above the traverse device, and device 11 formoving the fulcrum guides is provided with a plurality of fulcrum guides12 and 12′ corresponding to the bobbins 6 and 6′ inserted onto thebobbin holders 4, 5, 4′ and 5′.

The fulcrum guides 12 and 12′ are so constructed that they are movablein an axial direction along the bobbin holders 4, 5, 4′ and 5′. Thus,the fulcrum guides 12 and 12′ are fixed at positions corresponding tothe longitudinal centers of the packages wound onto bobbins 6 insertedonto the bobbin holders 4, 5, 4′ and 5′, during winding operation, whilethey are moved to the front side of the bobbin holders, i.e., near theoperating space, when the yarns are threaded onto the bobbins.

Further, the unit case 1 has the lower ends 14 a and 14′a of thethreading devices 14 and 14′ pivoted at the lower central portionthereof, and the threading devices 14 and 14′ are pivotal about thelower ends 14 a and 14′a and are moved between the returning position(FIG. 1) located below the central portion of the unit case 1 and theoperating position upon initial threading (FIG. 4) by means of acylinder (not shown).

More specifically, the threading device 14 or 14′ is so disposed that itcorresponds to the respective bobbin holder 4 or 5 located at thewinding position, and the threading device 14 or 14′ is provided with aninitial threading guides 15 or 15′ at an end opposite to the lower end.During storage, the threading devices 14 and 14 are stored at thestoring position (FIG. 1), and during threading operation, they aremovable from the storing position to the threading position (FIG. 4).The storing position is located at a position sandwiched by loci a anda′ drawn by outer surfaces of bobbins inserted onto the bobbin holdersprojecting from the turret tables upon rotation of the turret tables 3and 3′. Contrary to this, the threading position is located at aposition which exceeds contacting lines b and b′ between the pressrollers 9 and 9′ and outer surfaces of rotating bobbins 6 which arecontacting with the press rollers 9 and 9′, and at the threadingposition, a plurality of threading guides 15 and 15′ are movable in suchdirections that they move away from each other.

The threading device 14 and 14′ extend in a direction in parallel withthe sheet on which FIG. 2 is drawn and in parallel with the bobbinholders 4, 5, 4′ and 5′ from the front surface of the unit case 1 to aposition near the operating space, and the initial threading guides 15and 15′ are movable along the threading device 14 and 14′ by means of afluid cylinder (not shown).

Further, the unit case 1 has ends 18 a and 18′a of L-cross sectionedplates 18 and 18′ pivoted at the upper central portion thereof, and theplates 18 and 18′ are pivotal about the ends 18 a and 18′a. The plates18 and 18′ are provided with yarn guides 16 and 16′ which guide yarns toyarn catching grooves of the bobbins 6 and yarn passage limiting guides17 and 17′ which limit the yarn passage so that the yarns Y do not dropfrom the end surfaces of the wound packages of a predetermined amount.

The initial threading operation and the switching operation of the fullywound package in this embodied machine will now be explained.

<Initial Threading Operation>

Below the spinnerets of the spinning machine, while the yarn Y are beingsucked by a suction device SG, they are threaded onto the feed rollersR1 and R2 and the yarn guide G.

Then, as illustrated in FIG. 2, the fulcrum guides 12 and 12′ oftraverse motion equipped with the device 11 for moving the fulcrumguides are moved to the positions where the yarns are threaded frompositions corresponding to the longitudinally central portion of thebobbins, and the yarns are threaded into the fulcrum guides 12 and 12′.

Then, after the bobbins 6 and 6′ inserted onto the bobbin holders 4 and4′ are brought in contact with the press rollers 9 and 9′, the initialthreading guides 15 and 15′ are moved to the initial threading positionsillustrated in FIG. 2. Then, after the yarns Y are threaded into theinitial threading guides 15 and 15′, the suction device SG is positionedat the lower portion of the operating space of the winding machine asillustrated in FIGS. 2 to 4.

FIG. 3 shows the condition just before the start of initial threadingoperation, wherein the rotations of the bobbin holders 4 and 4′ and thepress rollers 9 and 9′ have been started and have reached thepredetermined rotating speed. As illustrated in FIG. 3, the initialthreading guides 15 and 15′ are moved to positions corresponding to theyarn catching grooves formed on the bobbins 6 inserted onto the bobbinholders 4 and 4′ by means of a fluid cylinder (not shown).

Then, the threading devices 14 and 14′ are swung by means of thecylinder (not shown) to the condition illustrated in FIG. 4. Morespecifically, the threading devices 14 and 14′ are swung by means of thecylinder (not shown) to positions exceeding the imaginary lines b and b′connecting the outer surfaces of the press rollers 9 and 9′ and theouter surfaces of the bobbins 6 and 6′, and the yarns deflecting at theinitial threading guides 15 and 15′ are engaged with the yarn catchinggrooves formed on the bobbins 6 and 6′, and winding of the yarns ontothe bobbins 6 and 6′ is started.

Then, the threading devices 14 and 14′ are returned to positions outsidethe area defined by loci a and a′ drawn by the outer surfaces of bobbinsinserted onto the bobbin holders so as to prevent the outer surfaces ofthe bobbins inserted onto the bobbin holders from contacting with thethreading device 14 and 14′.

<Winding Operation>

The operation from the start of winding to the completion of winding inthis embodied machine will now be explained.

The bobbin holder 4 is rotated clockwise while the bobbin holder 4′ isrotated counter-clockwise, and the yarns are wound onto bobbins 6inserted onto the bobbin holders 4 and 4′.

According to the present invention, the distance L between the centersof the bobbin holders 4 and 4′ at the winding start position is smallerthan the outer diameter of fully wound package. Accordingly, if theyarns are wound until completion of winding while the bobbin holders arekept at the winding start position, the full packages on the bobbinholder 4 and the full packages on the bobbin holder 4′ interfere witheach other.

In order to obviate this problem, according to the present invention,both the winding packages are moved away from each other as the windingamount increases so that the wound packages keep a predetermineddistance therebetween. More specifically, at the start of yarn winding,the yarns are wound onto bobbins inserted onto the bobbin holders 4 and4′ while the turret tables 3 and 3′ are fixed at positions, and thepress rollers 9 and 9′ are lifted together with the vertically movableframe 8.

When the diameter of the wound package reaches a predetermined amount,the turret tables 3 and 3′ are moved in such direction that thedistances between the press rollers 9 and 9′ and the bobbin holders 4and 4′ increase. More specifically, after the vertically movable frame 8lifts to a predetermined height, the yarns are wound onto bobbinsinserted onto the bobbin holders 4 and 4′ while the turret table 3 isrotating clockwise at low speed and the turret table 3′ is rotatingcounter-clockwise at low speed.

<Switching Operation of Fully wound Bobbin>

The switching operation of fully wound packages in this embodied machinewill now be explained.

When the amount of yarn wound as described above reaches a predeterminedamount, while the turret table 3 is rotated clockwise at high speed andthe turret table 3′ is rotated counter-clockwise at high speed, the yarnguides 16 and 16′ and the yarn passage limiting guides 17 and 17′ enterbetween the bobbin holder 4 and the bobbin holder 5 and between thebobbin holder 4′ and the bobbin holder 5′, respectively, as will bedescribed later so that the yarns are engaged with the yarn catchinggrooves formed on the bobbins 6 inserted onto the bobbin holders and arecut by means of catching force of the yarn catching grooves, and then,yarns 6 are wound onto the bobbins 6 inserted onto the bobbin holders 5and 5′.

The operation, especially those of the yarn guides 16 and 16′ and theyarn passage limiting guides 17 and 17′, will now be explained withreference to FIG. 5. FIG. 5 shows the condition just before effectingyarn switching after the amounts of yarn wound onto bobbins 6 insertedonto the bobbin holders 4 and 4′ reach a predetermined amount.

Under this condition, the front ends of the plate 18 and 18′ are liftedby means of a fluid cylinder (not shown), and the yarn guides 16 and 16and the yarn passage limiting guides 17 and 17′ are positioned at thereturning positions so that they so not interfere with yarns.

By means of a drive device (not shown), the turret table 3 is rotatedclockwise and the turret table 3′ is rotated counter-clockwise so thatthey are brought into a condition illustrated in FIG. 6. In thiscondition, the front ends of the plate 18 and 18′ are lowered (see FIG.6) by means of a fluid cylinder (not shown), and the yarn guides 16 and16′ and the yarn passage limiting guides 17 and 17′ begin to move fromthe returning positions to the operating position.

Then, as illustrated in FIG. 7, while the yarn wound on yarn package ofa predetermined amount is being prevented from dropping from wall end ofthe package by means of the yarn passage limiting guides 17 or 17′, theyarn guides 16 or 16′ are moved to the left in FIG. 7 so that the yarnis engaged with yarn catching groove of empty bobbin 6.

The full packages wound on the bobbins 6 inserted onto the bobbinholders 4 and 4′ are exhausted to the outside by means of a doffingdevice (not shown) after the rotation of the bobbin holders 4 and4′stops.

The plate 18 and 18′, the yarn guides 16 and 16′, and the yarn passagelimiting guides 17 and 17′ are returned from their operating positionsto their returning positions after a predetermined operations, such asthe threading onto the empty bobbins 6 inserted onto the bobbin holders5 and 5′, the exhaust of fully wound packages wound onto bobbins 6inserted onto the bobbin holders 4 and 4′, and the donning of emptybobbins onto the bobbin holders 4 and 4′, are completed.

As described above, since the two press rollers 9 and 9′ are supportedon one vertically movable frame 8, and since they are so constructedthat at least one of the rollers 9 and 9′ is independently movablerelative to the vertically movable frame 8, the difference in diametersof the packages wound on both the bobbin holders can be regulated.

Further, the threading device is disposed at the center of the twoturret tables 3 and 3′, and after the yarn wound on the bobbin holderdisposed on one turret table and the yarn wound on the bobbin holderdisposed on the other turret table are succeedingly guided to the yarnguide, the threading device is operated so that both the yarns aresimultaneously threaded, and accordingly, threading time can beshortened.

Although in the yarn winding machine shown in the embodiment, a traversedevice is disposed between two press rollers, as illustrated in FIGS. 9to 11, traverse devices 30 and 30′ for traversing yarns may be sodisposed upstream the two press rollers that they correspond to thepress rollers, respectively.

The traverse device may be a so called rotary blade traverse device,wherein a plurality of rotary blades are rotated in opposite directions.

The present invention provides a revolving type winding machinecomprising two turret tables having at least two bobbin holdersrotatably mounted thereon, respectively, a press roller and a traversedevice are arranged corresponding to the bobbin holders upstream therespective turret table, whereby a bobbin installed on one bobbin holderis switched to a bobbin installed on the other bobbin holder when theyarn wound on the bobbin reaches a predetermined amount characterized inthat the two turret tables are disposed on the opposite sides of a yarnpassage, rotational directions of a press roller provided for one turrettable and a press roller provided for the other turret table arereversed, rotational directions of the one turret table and the otherturret table are reversed, and the center of each press roller touchinga bobbin holder or a yarn being wound during winding of yarn is locatedbetween an imaginary line c connecting the centers of two bobbin holdersprojecting from the one turret table and an imaginary line c′ connectingthe centers of two bobbin holders projecting from the other turrettable. Accordingly, the width of a winding machine can be small, andspace efficiency increases.

Further, upon start of yarn switching operation, in other words, uponstart of rotation of the turret table, the bobbin holder is preventedfrom lifting the press roller due to the acceleration at the start ofrotation of the turret tables, and the bobbin holders can rotatesmoothly, and the inward movement of the outer yarn layer of packageupon start of rotation of the turret tables even at high turret speedand yarn package damage due to excessive contacting pressure can beprevented from occurring, and there is an unexpected advantage that thequality of yarn can be enhanced.

Further, in addition to the above-described geometrical construction,when an imaginary line connecting the rotating center of the pressroller 9 or 9′ and the rotating center of the bobbin holders 4 or 5forms an angle β which is not larger than 45° relative to a verticalline d, the moving direction of the press roller 9 or 9′ can be almostvertical. Therefore, the width of a winding machine can be small, andspace efficiency increases. Accordingly, increase of space efficiencyper production and reduction of equipment cost can be achieved.

Further, it is preferred that the imaginary lines c and c′ connectingthe centers of the two bobbin holders 4 and 5, and 4′ and 5′,respectively, form “/\” shape at least upon start of yarn winding. Morespecifically, the distance between the empty bobbins 4 and 4′ insertedonto the bobbin holders 4, 5, 4′ and 5′ is set smaller than the distancehaving fully wound package, and at the same time, it is set larger thanthe distance wherein the fully wound packages just after switchingoperation do not interfere with each other, and thus, the width of thewinding machine can be small.

Further, according to the present invention, the angle α formed betweentwo yarns leaving the feed rollers and entering the winding machine canbe not larger than 20°, and accordingly, deflection of yarns can besmall and the quality of yarns increases.

1. A revolving type winding machine comprising two turret tables havingat least two bobbin holders rotatably mounted thereon, respectively, apress roller and a traverse device are arranged corresponding to thebobbin holders upstream the respective turret table, whereby a bobbininstalled on one bobbin holder is switched to a bobbin installed on theother bobbin holder when the yarn wound on the bobbin reaches apredetermined amount characterized in that said two turret tables aredisposed on the opposite sides of a yarn passage, rotational directionsof a press roller provided for one turret table and a press rollerprovided for the other turret table are reversed, rotational directionsof said one turret table and the other turret table are reversed, andthe center of each press roller touching a bobbin holder or a yarn beingwound during winding of yarn is located between an imaginary line cconnecting the centers of two bobbin holders projecting from said oneturret table and an imaginary line c′ connecting the centers of twobobbin holders projecting from the other turret table.
 2. A revolvingtype winding machine according to claim 1 characterized in that animaginary line connecting the center of said press roller and therotating center of said bobbin holder forms an angle β which is notlarger than 45° relative to a vertical line.
 3. A revolving type windingmachine according to claim 1 characterized in that said imaginary linesc and c′ connecting the centers of the respective two bobbin holdersform “/\” shape at least upon start of yarn winding.
 4. A revolving typewinding machine according to claim 1 characterized in that a threadingdevice is disposed correspondingly to each bobbin holder located atwinding position, said threading device is provided with a threadingguide, and during storage, said threading guide is located at a storingposition which is sandwiched by loci a and a′ drawn by outer surfaces ofbobbins inserted onto said bobbin holders projecting from said turrettables upon rotation of the turret tables, while upon threading, aplurality of threading guides are movable in such directions that theymove away from each other from said storing position to threadingposition which exceeds contacting lines b and b′ between said pressroller and outer surfaces of rotating bobbins which are contacting withsaid press rollers.
 5. A revolving type winding machine according toclaim 1 characterized in that a traverse device for traversing yarns isdisposed between said two press rollers.
 6. A revolving type windingmachine according to claim 1 characterized in that a traverse device,corresponding to respective press roller, for traversing a yarn isdisposed upstream said two press rollers, wherein said traverse devicehas a plurality of rotating blades, rotating in an opposite direction,so as to traverse a yarn.
 7. A revolving type winding machine accordingto claim 1 characterized in that said press rollers are movable so thatdistance between the centers of said press rollers and said bobbinholders are expanded as the amount of yarn wound on bobbins insertedonto said bobbin holders increase.
 8. A revolving type winding machineaccording to claim 1 characterized in that said turret tables havingsaid holders projecting therefrom are movable so that distance betweenthe centers of said bobbin holders and said press rollers are expandedas the amount of yarn wound on bobbins inserted onto said bobbin holdersincrease.
 9. A revolving type winding machine according to claim 7characterized in that said press rollers are linearly movable.
 10. Arevolving type winding machine according to claim 7 characterized inthat said press roller is rotatably supported at an end of an arm, andthe other end of the arm is pivoted.
 11. A revolving type windingmachine according to claim 1 characterized in that a feed roller isdisposed upstream said winding machine.